complementation

/K AA1 M P L AH0 M EH0 N T EY1 SH AH0 N/
noun
  1. 1

    The replacement of a set by its complement

  2. 2

    The interaction between two genetic units such that an organism can function normally if either one is defective

  3. 3

    (grammar) The relationship of a phrase to its predicate

Source: https://en.wiktionary.org/wiki/complementation